How many moles of oxygen atoms are present in 0.200 mol of zinc chlorate, Zn(ClO3)2?
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Correct answer
C. 1.20 mol
Principle or equation
The formula unit Zn(ClO3)2 contains 2 chlorate ions, each with 3 oxygen atoms, so there are 6 oxygen atoms per formula unit. Moles of atoms = moles of compound × atoms per formula unit.
Why this answer is correct
In Zn(ClO3)2, there are 2 ClO3 groups, each contributing 3 O atoms, giving 6 O atoms per formula unit. Therefore, 0.200 mol × 6 = 1.20 mol of oxygen atoms.
Example
For 0.200 mol of Zn(ClO3)2, oxygen atoms = 0.200 × 6 = 1.20 mol.
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